CVE-2026-56114

MEDIUMNVD 6.55.3▼
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-06-23. NVD baseline CVSS 6.5; sources differ by 1.2.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.

CVSS v3
6.5
EG Score
5.3(medium)
EPSS
7.2%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 28, 2026

Advisory Details (2)

Auto-updated Jun 23, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

dhcpcd Stack Out-of-Bounds Write in dhcp6_makemessage() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/dhcpcd-stack-out-of-bounds-write-in-dhcp6-makemessage
github_commit

commit 2f00c7bfc408 (NetworkConfiguration/dhcpcd)

Fix landed in NetworkConfiguration/dhcpcd commit 2f00c7bfc408 — awaiting tagged release

https://github.com/NetworkConfiguration/dhcpcd/commit/2f00c7bfc408b6582d331932dfa47829c4819029

Vendor Advisories for CVE-2026-56114(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 24× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 02:56 UTCEG score recompute
  2. 2026-07-07 02:56 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-06 02:18 UTCEG score recompute
  8. 2026-07-06 02:18 UTCGHSA enrichment
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-05 01:40 UTCEG score recompute
  12. 2026-07-05 01:39 UTCGHSA enrichment
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-04 01:01 UTCEG score recompute
  16. 2026-07-04 01:00 UTCGHSA enrichment
  17. 2026-07-03 00:22 UTCEG score recompute
  18. 2026-07-03 00:22 UTCGHSA enrichment
  19. 2026-07-01 23:44 UTCEG score recompute
  20. 2026-07-01 23:44 UTCGHSA enrichment
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 23:06 UTCEG score recompute
  24. 2026-06-30 23:06 UTCGHSA enrichment
  25. 2026-06-29 22:28 UTCEG score recompute
Show 22 more
  1. 2026-06-29 22:28 UTCGHSA enrichment
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-28 21:51 UTCEG score recompute
  5. 2026-06-28 21:51 UTCGHSA enrichment
  6. 2026-06-28 14:07 UTCEPSS rescore
  7. 2026-06-28 04:56 UTCEPSS rescore
  8. 2026-06-28 04:56 UTCEPSS rescore
  9. 2026-06-28 01:44 UTCNVD updateCVSS v3 → 6.5
  10. 2026-06-27 21:13 UTCEG score recompute
  11. 2026-06-27 21:13 UTCGHSA enrichment
  12. 2026-06-27 03:08 UTCEPSS rescore
  13. 2026-06-26 20:35 UTCEG score recompute
  14. 2026-06-26 20:35 UTCGHSA enrichment
  15. 2026-06-25 19:57 UTCEG score recompute
  16. 2026-06-25 19:57 UTCGHSA enrichment
  17. 2026-06-25 13:49 UTCEPSS rescore
  18. 2026-06-24 19:19 UTCEG score recompute
  19. 2026-06-24 19:19 UTCGHSA enrichment
  20. 2026-06-24 14:05 UTCEPSS rescore
  21. 2026-06-23 17:35 UTCEG score recompute
  22. 2026-06-23 17:34 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-56114?
CVE-2026-56114 is a medium vulnerability published on June 23, 2026. dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTIONPDEXCLUDE option body.…
When was CVE-2026-56114 disclosed?
CVE-2026-56114 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on June 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56114 actively exploited?
CVE-2026-56114 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56114?
CVE-2026-56114 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 5.3.
How do I remediate CVE-2026-56114?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56114, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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